Alert archive / North Carolina / Flash Flood Warnings in 2021

Flash Flood Warning 45, NWS Greenville-Spartanburg, SC

October 7, 2021Burke County, North Carolina

NWS Greenville-Spartanburg, SC issued this flash flood warning at Oct 7, 2021, 11:03 AM EDT for Burke County, North Carolina. It was in force for 6 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Oct 7, 2021, 11:03 AM EDT (15:03 UTC)
Expired
Oct 7, 2021, 4:33 PM EDT
In force
6 hr
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon
Flood severity
None

County Burke County, NC

The radar

The Greer radar (KGSP), 99 km from the middle of the area, began a volume at 15:03 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Oct 7, 11:30 AM EDTFLASH FLOOD4 W Pleasant Grove, NCRICH MTN RD BRIDGE AT HENRY FORK WASHED OUT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 3.1 hours before the alert went out and 161 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 12:00Z on 2021-10-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 12 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2021-10-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
12 J/kg
Mixed-layer CIN
-174 J/kg
Mixed-layer LCL
599 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
101 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

461 
WGUS52 KGSP 071503
FFWGSP
NCC023-072045-
/O.NEW.KGSP.FF.W.0045.211007T1503Z-211007T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Greenville-Spartanburg SC
1103 AM EDT Thu Oct 7 2021

The National Weather Service in Greenville-Spartanburg has issued a

* Flash Flood Warning for...
  Southeastern Burke County in western North Carolina...

* Until 445 PM EDT.

* At 1103 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across eastern Burke County. Between 2 and 4 inches of 
  rain have fallen in the past 60 to 90 minutes. Additional rainfall 
  amounts of 1 to 2 inches are possible. Expect rapid flooding of 
  low-water crossing and other low-lying areas adjacent to small 
  streams, especially in the upper reaches of Henry River, Henry 
  Fork, and Jacob Fork, and areas in the South Mountains. Expect 
  flooding to begin and worsen over the next 1-2 hours before area 
  streams crest and flooding begins to recede. Avoid all flooded 
  roadways and seek higher ground if you live next to a small 
  stream. Campers in the South Mountains along creeks and streams 
  need to be ready to seek higher shelter if water starts rising 
  rapidly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Icard, Hildebran, South Mountains State Park and Pleasant Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3572 8162 3572 8140 3561 8151 3556 8154
      3556 8158 3557 8158 3557 8160 3556 8165
      3557 8167 3558 8169

FLASH FLOOD...RADAR INDICATED

$$

TDP
1 follow-up statement
902 
WGUS72 KGSP 072033
FFSGSP

Flash Flood Statement
National Weather Service Greenville-Spartanburg SC
433 PM EDT Thu Oct 7 2021

NCC023-072043-
/O.CAN.KGSP.FF.W.0045.000000T0000Z-211007T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burke NC-
433 PM EDT Thu Oct 7 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN BURKE COUNTY...

The Flash Flood Warning has been replaced by a Flood Warning since 
the flash flood threat has passed but area streams remain above 
bankfull levels.  Please continue to obey all barricades and avoid 
flooded roadways.

Additional heavy rainfall is possible later this afternoon and may 
cause new flooding to develop.  Please stay weather aware and have 
multiple ways to receive warnings if additional flooding occurs.  A 
Flash Flood Watch remains in effect until 1200 PM EDT Friday for 
portions of northeast Georgia, western North Carolina and upstate 
South Carolina.

LAT...LON 3572 8162 3572 8140 3561 8151 3556 8154
      3556 8158 3557 8158 3557 8160 3556 8165
      3557 8167 3558 8169

$$

JMP

The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 7, 12:20 AM EDTAreal Flood AdvisoryGSPAvery, Caldwell2 hr
Oct 7, 6:40 AM EDTAreal Flood AdvisoryGSPBuncombe, Haywood, Henderson, Transylvania3 hr
Oct 7, 6:59 AM EDTAreal Flood AdvisoryGSPTransylvania5 hr
Oct 7, 7:08 AM EDTAreal Flood AdvisoryGSPJackson, Macon, Transylvania3 hr
Oct 7, 7:34 AM EDTFlash Flood WarningGSPBuncombe, McDowell, Rutherford7 hr
Oct 7, 8:10 AM EDTFlash Flood WarningGSPHenderson, Rutherford3 hr
Oct 7, 9:05 AM EDTSpecial Weather StatementGSPBurke55 min
Oct 7, 9:25 AM EDTFlash Flood Warning Considerable damage threatGSPBurke, McDowell5 hr
Oct 7, 9:41 AM EDTRiver Flood AdvisoryGSPBuncombe, Henderson3 days
Oct 7, 9:41 AM EDTRiver Flood AdvisoryGSPBuncombe17 hr
Oct 7, 9:46 AM EDTRiver Flood WarningGSPHenderson, Transylvania68 hr
Oct 7, 10:53 AM EDTAreal Flood AdvisoryGSPTransylvania6 hr
Oct 7, 11:19 AM EDTAreal Flood WarningGSPHenderson, Rutherford6 hr
Oct 7, 11:49 AM EDTAreal Flood AdvisoryGSPHenderson, Polk8 hr
Oct 7, 1:02 PM EDTAreal Flood AdvisoryGSPMacon, Swain8 hr
Oct 7, 2:01 PM EDTAreal Flood WarningGSPBurke, McDowell4 hr

Nearby

Flash Flood Warnings in North Carolina, 2021Every flash flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.